init fraglist list head in cmdu_realloc()

src/cmdu.c

@@ -352,6 +352,9 @@ struct cmdu_buff *cmdu_realloc(struct cmdu_buff *c, size_t size)
 	f->cdata = cdata_off ? (struct cmdu_linear *)(n + cdata_off) : NULL;
 	f->end = f->head + size;
 
+	/* TODO: reconstruct fraglist */
+	INIT_LIST_HEAD(&f->fraglist);
+
 	return f;
 }